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duality, dichotomy | being twofold; a classification into two opposed parts or subclasses | |
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duality, wave-particle duality | [in physics] the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory | |
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duality | [in geometry] the interchangeability of the roles of points and planes in the theorems of projective geometry |